/*
 * Copyright 2023 AntGroup CO., Ltd.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 */

package com.antgroup.geaflow.dsl.runtime.plan.converters;

import com.antgroup.geaflow.dsl.runtime.plan.PhysicAggregateRelNode;
import com.antgroup.geaflow.dsl.runtime.plan.PhysicConvention;
import com.google.common.base.Preconditions;
import org.apache.calcite.plan.Convention;
import org.apache.calcite.plan.RelOptRuleCall;
import org.apache.calcite.plan.RelTraitSet;
import org.apache.calcite.rel.RelNode;
import org.apache.calcite.rel.convert.ConverterRule;
import org.apache.calcite.rel.core.Aggregate;
import org.apache.calcite.rel.logical.LogicalAggregate;

public class ConvertAggregateRule extends ConverterRule {

    public static final ConverterRule INSTANCE = new ConvertAggregateRule();

    private ConvertAggregateRule() {
        super(LogicalAggregate.class, Convention.NONE, PhysicConvention.INSTANCE,
            ConvertAggregateRule.class.getSimpleName());
    }

    @Override
    public boolean matches(RelOptRuleCall call) {
        LogicalAggregate aggregate = call.rel(0);
        Preconditions.checkArgument(aggregate.getGroupType() == Aggregate.Group.SIMPLE,
            "Only support Aggregate.Group.SIMPLE, current group type " + aggregate.getGroupType());
        return true;
    }

    @Override
    public RelNode convert(RelNode rel) {
        LogicalAggregate aggregate = (LogicalAggregate) rel;

        RelTraitSet relTraitSet = aggregate.getTraitSet().replace(PhysicConvention.INSTANCE);
        RelNode convertedInput = convert(aggregate.getInput(), aggregate.getInput().getTraitSet()
            .replace(PhysicConvention.INSTANCE));

        return new PhysicAggregateRelNode(aggregate.getCluster(), relTraitSet,
            convertedInput, aggregate.indicator, aggregate.getGroupSet(),
            aggregate.getGroupSets(), aggregate.getAggCallList());
    }
}
